Cylinder relief-valve



(No Model.) I*

B. T. REILLY.

. CYLINDER EELIEE VALVE. No. 530,853. Patented Deo. 1,1-, 1894.

v from the inner part of UNITED STATES PATENT OFFICE.

v BERNARD THOMAS REILLY, OF WILKESBARR, PENNSYLVANIA.

CYLINDER RELIEF-VALVE.

SPECIFICATION forming part of Letters Patent No. 530,853, dated December 11, 189

Application filed J' une 7, 1894.

To all whom it may concern'.-

Be it known, that I, BERNARD T. REILLY,

a citizen of the United States, :residing at waste pipe, the said piston valve being held normally open by a spring and being closed against the pressure of the spring by the superior force of steam from the steam supply pipe or steam chest of the engine yacting upon a piston larger than the valve piston.

Theinvention further consists in details of construction which will be presently described in connection with the accompanying drawings, in which- Figure 1 is a side .view of an engine cylinder provided with my improvements. Fig. 2 is a bottom plan View of the same, and Fig. 3 isa sectional view of the valve showing its, interior construction.

Referring to Figs. 1 and 2, A indicates the cylinder of an engine and B the steam chest.

C, C, indicate relief valves attached to a cylinder to permit of the discharge of any water of condensation which may accumulate in the cylinder. l

D indicates a branched steam pipe which conducts steam from the steam chest to an outer part of the casings of the valves C, and E, E, indicate water waste pipes leading the valve casings.

In describing the valve I shall, for convenience, term the end which is connected with the engine cylinder the inner end, and the piston end the outer end. The valve casing is formed with an inner cylindrical portion l and a larger outer cylindrical portion 2; and these cylinders are provided with pistons 3 and 4 united to a common piston serial No. 513.778. (No man).

rod 5 and piston rod 5 is extended through the outer cap 6 of the valve casing and forms an indicator Fto show the position of the valve. The larger piston 4 is normally pressed toward the head 6 by a spiral spring 7, which is seated in the neck of the valve casing and bears upon the inner side of the smaller piston 3.

The Valve casing is provided with three ports. There is a port 8 at the inner end which communicates with the engine cylinder, a port 9in the side of the smaller cylinder l and normally in communication with the port 8; and a port 10 communicating with the larger cylinder at the outer side of the piston 4. The port 10 communicates with the steam chest or steam supply. The normal position of the piston 3, that is, the position assumed when' the engine is stopped, by reason of the action of the spring 7, is at the outer side of the water port 9 thus permitting the engine cylinder to drain through the ports 8 and 9. The piston 4, however, is

larger than the piston 3 and, owing to its greater surface, the pressure of the steam when the engine is started forces the pistons 3 and 4 inward thus cutting o communication between the engine cylinder and the port 9. If, however, any water accumulates vin the engine cylinder while the engine is running, itwill, owing to its incompressibility, press the piston 3 outward against the steam pressure and escape through the ports 8 and 9.

Relief valves which I have heretofore tried, have been annoying and self-destructive by reason of the pounding of the valves upon their seats when the steam is turned on. In my invention there can be no such effect for the reason that the valve cylinder l is of such length that the tension of the spring 8 will stop or nearly stop the movement of the valve piston before it reaches the inner end of the cylinder. The valve piston 3 is arranged to-cut ed the port 9 from the port 8 before reaching its innermost position.

Another feature of my invention is the indicator rod F attached to the valve to show its position. Relief valves are very liable to be clogged with gum or thick oil from the engine cylinder, and it is important to know at all times their position and Whether or not they are Working perfectly. For this reason I have extended the piston rod 5 to form an indicator which will show exactly the position of the Valve at all times.

Having described my invention, what I desire to claim and secure by Letters Patent 1. In cylinder relief valves the combination with asteam supply pipe D and with the engine cylinder, of the casing having a small inner cylinder and a large outer cylinder fitted with pistons upon a common piston rod, aspring normally holding the pistons in their outer position, a port at the inner end of the casing communicating with the cylinder, a port in the side of the inner and smaller cylinder normally communicating with the inner end port of the casing, and a port arranged to admit steam to the outer side of the larger and outer cylinder, the inner piston being adapted to travel over the side port of the inner cylinder, substantially as described.

2. In cylinder relief valves the valve casing having two cylindrical portions of dit ferent diameters, pistons fitting said cylinders and arranged upon a common piston rod, an indicator rod'connected With said pistons and piston rod and extending outside of the casing to show the position of the pistons, and ports in the casing communicating respectively with the engine cylinder and steam supply and the Water Waste pipe, substantially as described.

In testimony whereof I affix my signatu re in i presence of two Witnesse BERNARD THOMAS REILLY.

Witnesses:

EDWARD OBRIEN,

FRANK CULL. 

